Duplicate truffle contracts types

src/contract_wrappers/contract_wrapper.ts

@@ -1,7 +1,7 @@
 import * as _ from 'lodash';
 import contract = require('truffle-contract');
 import {Web3Wrapper} from '../web3_wrapper';
-import {ZeroExError} from '../types';
+import {ZeroExError, Artifact, ContractInstance} from '../types';
 import {utils} from '../utils/utils';
 
 export class ContractWrapper {

src/types.ts

@@ -267,3 +267,11 @@ export interface OrderFillRequest {
 }
 
 export type AsyncMethod = (...args: any[]) => Promise<any>;
+
+export interface ContractInstance {
+    address: string;
+}
+
+export interface Artifact {
+    networks: {[networkId: number]: any};
+}